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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5491a70e1596b4aad88bf0e63010de6abe42c085a4009e76acbb3a3415e9ee16' 
  AND token = 'NMAU8t7dv+irvVlxAwzwM0rbcFtyQzoVapIbPBf3+Yo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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