SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eda88ead57d621ca83911ca4b80854829d10e395f755337dd7887bfc6fd8b461' 
  AND token = 'TvkU6s9olb1KQBldlGvNRGKxFS2Lk2DZXyYWHL4UzjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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