SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '869d5a62d8ed893ae13cd4a5ffc1a6f224ae741afbd54167b9840984be5d559c' 
  AND token = '+yM2Vm3dfJg3iifUdEUKgGqhjNHUez4QXigxq7SwIxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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