SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b075f5635b09aef08883b39c9563fab3fe140e17c62a578613096ae3557c53e' 
  AND token = 'eokPqlL4hTpmVRuGr2r1pmF6nSq82xYphUJwdcgzKwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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