SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55f53354794276624fc15c4de56f3a2054bed6bd9b4332a001f18a00c8940373' 
  AND token = 'VXcNUpSRClIuyTXlVWhi41zf2+HqduTXqzSuOKhJB4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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