SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2131c0b579d1d407ccfb9356469779155346caad921efc08f7e522d3a7267e75' 
  AND token = 'a+BBIwZMqeOW+k3uJVylOGoi4yxNBh8ROfyjARKbrbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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