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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2405567a7e6103ddca6a00bc2fa6b7708b2ba6fea4e111aefc7587a089decd37' 
  AND token = 'tCJ0we6soSBZax4U3YFy/+HgCANrfvK2wrPDE+EsWlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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