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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd3772c591560ba75dde7c699ba046bf7c175d1491a6993db286975ade86e391' 
  AND token = '7B/p2xRjyq9OLq7kl59eGhQzIbfMI8Py0n1Hue5jXAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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