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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d6c938fdfe39023098b5d6be3af13a63e9ecba5082faa1bb21ac1487667d93f' 
  AND token = 'qbDrMXZ9mBgf2DkxOyWq4XlNjWTLi0NkVqOLjG/SDEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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