SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6a30b13203d67c37d9e150a7897dc4bf593dfd07b2ec6ed12162bfe64b3184c' 
  AND token = 'y2sQ/0+j/lHrHROvnTvJ62IF6GBacA5YtxmNzgzJqy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00108

JSON explain

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