SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec23041adaa86b4ea268279f5df84208c39ffa7834af5ea491d33ed9624ad3c4' 
  AND token = '+gIolfFluaMkPYQBCcL5g7hGtK3FsDp1TSvErJw6Zo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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