SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6c6e9bb2d72eea1f759eec2af5e14c706815bae89adb3ae7090c552c5274d41' 
  AND token = 'YzYrG+mFGlzXX5uSmvYqLvVO2Qmh6cwYn7VJr0bHVWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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