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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd298bb64b0fffaf9d36f21e8b11c5357bcc9f84b13b6c77b2a5686eb03962eca' 
  AND token = 'Kbk0o9Iu8fr+GU+MGROYN3Nkj7rjtZogC/Fo0mQwoTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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