SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cfb65163b4aeac520d0c634f916e1c3664449a06f6d8373b47f045ad6ebf654' 
  AND token = 'Yl2vJqhzltUBpDucpRXCP2go8LHhxw872S8PJU6+wws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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