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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3db2c2af8d6b801b2cb3a1026594789928ee70684f30e61dec7e1086e62a95e6' 
  AND token = 'HSfBPM6ljTyMN+2YmPdFSVOl6kfwJfIa7541cv2WDJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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