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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29cedf449661790ebc644971b2168e0f4e3c9b2abe763fb90b69e9a76eb1780c' 
  AND token = '4eCynDrilu6K+jK01qi7YU5a8OzdNS67hESk/FqNk7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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