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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '598f72730495db3d1d2c3d05c8db2d7e5e9ad217114c14cdda67a01c846332ea' 
  AND token = 'ku68wrQS7I/M8b+fkmEGMDQ7WCRRRNMxG1eE79u3Ggs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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