SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ccd230d8cd74f74a33e54fb16a8ff5489968849b448b46c20312d58bea58b2d' 
  AND token = 'r695q/criv37/XPKmJiNnfp6R7a2qZUoZwXfYT/vwjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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