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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d388047e715bf81c6474e8cd483737f67262cf06a77aaa671cbdd140e014836' 
  AND token = 'Z+Kpwybi9lmKerrmjR2qFGknfDd3xkU1TszooThheWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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