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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17195351415714c0fa61fb8ab4cf568edef7d05691829ab75b88daada7619582' 
  AND token = 'mq0LBLKoALqqjq2iu3AxyO8KGDbIs5og6XIzubKlr6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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