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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '836b5fff769ebea96f146a4d97649ae921388951f12483b9ab9e3cb3c9895dcc' 
  AND token = 'VlFfczD62fuuz9pqlHUnbfZu4AEU45eHib8Vk7nd89o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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