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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d0fd4d34a9389a2b3726faab62f6316a9aa60fed24b7d4886ee206a90f211dd' 
  AND token = 'fIKHE3V3WLpYrYs6zOL4jB5PiUMjcVdMePvJl1nDxnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00081

JSON explain

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