SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e8d9081f89447c2d6c55644a00a7f38b7888ae67e5b519112596d867ee693f2' 
  AND token = 'PaDsw9L0gtqDMI/tTYDGVKnw5Raz+nUiQa29Sr5CzWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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