SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b001621087e41227329943ddf334f7beeea95786fd62a026b4d7376874d7a56' 
  AND token = 'tpsIf+ZZoV1DCb7z/cOalR7jIOYV5yhFmvW3iJkf6ZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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