SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36da95f45b2712e34f1e664578b65fa7483fd665d973e008f20395bba23c5ab5' 
  AND token = 'ggUFUJRs/OvBCkupX+OlAB3q3yI3tQqPtIPHtod+Y7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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