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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1265d8b8a969e0743e94d4848c165fea1e12764d282bbf1fca0fcbd2a5ba7fff' 
  AND token = 'loFobgVWSJhHOcK8JEEZMJKAHb1S6Qr2hm2fYv0yiPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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