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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6eca1e63ad615bd7d314f44cfc932a29a93356b8b2f48d772a6a8824fc833d1f' 
  AND token = 'V9WbCE10/F3s8wDFxnok/70ZPBaJf/omR9Qxz1TnKTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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