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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af2dfe1a25f10a093d61f12b0dc1ed2785225d28ece9c8bc727dcc0712929a90' 
  AND token = 'uaICfVxiAPRu7K9dHwmmx72McSBZ6DFfjDpndw76eCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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