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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d2eae1c8f884ab5d955332ea9dd0f39e6b1faade8699d0a963fd7f1cd81357c' 
  AND token = 'fQBtB5mMZqJf0pIq32+Fdx7fnkRo9JS+KJy3r5ma+R4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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