SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95c0678a700cf61a23246ec4637542692151923cc0098705fd79fd5d1a60ed58' 
  AND token = 'qBqVhGvozHRf6/6h9ygDIfdU5iU+Pl0jw7mHXMb7rfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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