SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86d12e5e13ace8ddbfd84a3611b1a8642ab7783cfa22785bde6c9d3c6ef7afcb' 
  AND token = 'QwYjXLPuFXDGnyDzO5Sh+SPLcTbUVjOllBb18XGU9+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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