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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f39b00d46885d8183da69ee4af58198d68b3c87661d19496c7ead505cb45d633' 
  AND token = '6koa9XjhLnA/7pb30LvPSC+XjnnDSvfj2kg0Ib+OjfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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