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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfb14e591b5ac7a4ba8da025a150b31595c9bdab66e26258a9fad18bcf20086b' 
  AND token = '9vBCV5NORJ73Fd6CjofdyDp88Rf6Hd6v7LwKXhLfU8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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