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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '890480fe363a5aa96b557b6929ba4d486a144dadf0d2ee034240a726e02412bb' 
  AND token = '1tVK8W8KLvUp+GGSM79Mxwp9a74+WMf1KxHQhepZODM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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