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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76ab9cde1020d3a0e6d9cf49f1107e84273882ec4db63c50edea03ddf551c71d' 
  AND token = 'B/N6ZDTw+8utdHpAQWPyzgWIn84Hzpv7g7gHU50NHGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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