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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60cbd921dc1de5a18b0a25a351e5567420bf1c54ec7effac68938c8bdfad8d1a' 
  AND token = '4Ea019GgzFpNu6zCe2z0XVr8g0bkh0o5vAzOHd5YOCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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