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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d778e849b5d8c89c0daf7220df96ad94c8ee671f4bad67c9547aa28467baf68' 
  AND token = 'kdoaKovDjuurogedVC/jKIeeblhRzFuqCZ/7KDyVC+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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