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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96b867b17b131b5d855f99a5e51c943f85427841b732588fe663e33ce100e37f' 
  AND token = 'vuqTJZUfliXEka+YS5b4z7DmKhMeTPPQtVGIekQ1AbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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