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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da86d5534191a2a56cb1d09b508c7ff423b668ec6d4d080b616f4dc59a704719' 
  AND token = 'v4M0SCh2rgumG7mEnHSo7afhPNoDI4TYmZF7t/ZtyV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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