SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bdf1361bbc053f8237274dc67bea08a9360be177499292860b1bc0f7e1b384a' 
  AND token = 'vZhfKlpMLRK6tIj/aJtGtY9oc8z6Xwx+azAMia87f5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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