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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86603b728f685ee901b6a7dd1c20faedaeb4490bffceb88a49e9cee30cc25e21' 
  AND token = 'b0dkfM7Ark11v5OibkGymG1K68zxv+7trTrMEzqIOdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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