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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6076ead6fd0e4dff3430dae85bebaae33b4c7d0636a9822edccf1a2d4e4fbd85' 
  AND token = 'Bts3SdcOPr9iexL9ocG5uIe7UFA1RLsjTyw6qmlBiJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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