SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce72877ca582a740d56e0e060f31f161da5dbe8d7763c0ebdf41c8893c4ecfa9' 
  AND token = 'SUJAuwpwfTyFKvYBML0ViY2+r/ztZ1pI5Pr+Sr4kSjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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