Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1420d69973998953bbce8e6d6ea46daa0da3d678aa4c9480a1cbbac0827748a' 
  AND token = '1d+YOY5JRv9VaNMVZ/bpgICkMnV4XCQl0T7PjXtAuNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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