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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '033626dcacc45bd03e766bd80830f6844851a4f1c78993be21f52b81e79c3798' 
  AND token = 'VwV5fFTn8Fnm+W8jhRS3oxM6ukvmmQv2T0Su7YXvu/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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