SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '031b103c24b935cf9d0780ab6757bfe662eaa5d1db14c9d7e25a6542c915aa62' 
  AND token = 'TOig0sFjo+vDQ44UKxBbQiwR/LTZVCFGRI1T23Q3jc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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