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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b175a486257c86db856700363b8efc32df285bb07df0b49d436dd052844dd22' 
  AND token = 'CKNmhReMI8iuU5ZJ9gcZI5Q3jZvoi8fGrBNnSlpvyw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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