SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f72f11f7183438014a1a24ceba6cd2232780d5532fa49ce165b0e4d8419d968' 
  AND token = 'jTRs3cp2US7g9tOeUaV43nV5X1/KaCi9nC/mhZZHaV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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