Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'defa30ba55450cfba302dfb814c848c2031ff5207cd819f1d6b949e1d2a72104' 
  AND token = 'yFU8bvMZZ5Q+uATtFmB5OoTyciauiRvDNCpMo8D3nmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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