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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88fcfe3f16802596c841fb4d3ffd8afbb5e656c67426762251259c34d93c6a08' 
  AND token = 'jd3pduQDJz8KRjFW9+9B9cLNenYxAJuHirlA0WuLcQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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