SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cfb945d57b3d16feb31c9b9437492d9cc149ae0bcf9c78a9345ae7e00d97d79' 
  AND token = 'PBCTedQ2B6R97ODzFN8WkkedXP4TQVCwuQUGFK7Tr6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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