SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb77b0f8638a890f1b42337e5fccf87d351d99ab41af24ec297305ab64ba13fc' 
  AND token = 'oHACGww9IuF5qW+VsX21GcARp7KwdpTOXqg5DS1f+vQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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