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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01ba1fe0e83c69e531b734e2713fc9fc102da576d09c40cc91747b6f597bb923' 
  AND token = '4DomM+ccuPHcjqwSKjH3/ko9IaQT/2Ixe50wIylDEZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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