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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7919624dba2099af3088168a4ccfa73ac1c37ef0a3c7430df593b3c38f6c4e88' 
  AND token = '05ZN6tqMxwQpqTgm7kDq1jF5zznxe4yeem0HWyy5VlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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