SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd85ea71c85d8f7f04b4b228983643a416fd09bfa776bf94d46385dd60082fbd2' 
  AND token = 'S5iACt1jiTwwKERZG69tH2oBvf5s+XH+0MpfTkhzLOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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