SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '053e475a791e87251617990afccd58477739e4106023e494d0127dc96397e182' 
  AND token = 'uQdZmOC5H5fpu0Ud+g//wv8zj2wWKiWZlYu9XDbSWII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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