Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f440830d5dd8900e5ccaa2ec493780968dc88f70f9eecb79705ad8224dd146d5' 
  AND token = 'N4H55Ys3G3NVWmNDXb8ejhCVRDAWi+u1tna5UxLD0Cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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