SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f898ddfab20b31e8e56bc54f97bc8b4a9e0866d3173c641abef67073600e7f2' 
  AND token = 'ht/+2jhs40aE+HqkzovD/MHvHiWUYCSjSxFm1Ll9RZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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