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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4864d8bae84e25005351cbf2823be51bd2e2b3e3b7636fb16bbb097982e5be30' 
  AND token = '3XDrTpjg41TRI3IESXBahh9ql4j7OfXWaDtaDl0cPPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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