Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b83a5878cd14eb2e1c73c0b7e0af9f81a13fdf255be9e09a2cd2d2ae64639323' 
  AND token = 'aA8hALdcQTd90VVfkr2deNciebmnkXDShhn/oAzV3LA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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