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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca119276a3af2d795218db37f2e3034283c83cbab06d3d903b5e529960871ae4' 
  AND token = 'HC2OMFxtOGyoJjbw7MYPKCCzzyMMcOJJIucXKISf7aU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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