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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0450ef28c0b9e2b5483e92bef0ff31757b165464fb12c78513c2a8fc045ac013' 
  AND token = '1GgHN7VObLIhLbQ0703PlJyu72laxWGIleEGHWPCZIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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