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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd48090c5af4171ec940b4b49f96f1549892deca22ecc8371d062b89fc0268177' 
  AND token = 'FoydY5CZ6ZdZki7V4WS1iwWGBcIYgZK8PV/JFUj5Akc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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