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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b3fe2fe26902e8ddbe2832cdae12c60f5925af904f12dfc5f12c0dcce0963cd' 
  AND token = '9T9OzLicT+RfXUxwtenY6Lim70mvBdCB9l2jJpcDM/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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