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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '992c13eea55c25b96c6623b60a85b2fd0f4f5e27500a57f7322984f1416ad6da' 
  AND token = 'HtYS9EJE+r4xMPx4CscPZD3GO0o7Fl76swKDpM872zI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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