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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e631b6b840637d7b348c70ef4e176baaa379067e00959c7eba5303fc7699891' 
  AND token = 'NzINGH7Z9hjRukn19XGJfcxArczOIt8YaPf2Y/cxd7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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