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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38cac2b8e59a7565352bb297894481e443155c9ac2a43391bdd651b1dcb0b813' 
  AND token = 'lH8wZyR15JBnchu9sgoe5A4YwqtdfN6edYphuXysl6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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