Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6d92f103a79b61b0070b25ae9a058522806de66c77aa5bde6708dca95aebe38' 
  AND token = 'aCc/3LgrdMzj00tR02M933RW5vcr99P9Bgz+DxFkKIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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