SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '989a20d3df8a55585f96b83ff09d379de12e18737c89d7b975bdfb8a4b9def47' 
  AND token = 'Hg+w6aZyQ/YvAoAruzpXVCsdmjKrQpCfOYhgEX+dvYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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