SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb86f417928da610b96dd24274d3cbc43029773def150a01f69c5465e062bfa8' 
  AND token = 'MwXdl0EY7EhgCoC0cQ03jUpPKREFQ8VvJsozM4NNq3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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