SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9211974796d12702bfbaf59f633bf034c5cf48cf47eac80eaf0bfbc429ef58d2' 
  AND token = 'KUpH3ho+AkhFQXazc3DxK7LrvmFJjzoBN6r2o7E4jPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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