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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a32e22ff6acda94089a8ef4be5df1dd6f9061239843bfb940e9d04a6a0b6421a' 
  AND token = 'FHQo5zkTYYBe6HPizbceRrIVMob4jajqg4rn/YsjWAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00084

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}