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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86a7ce0c711ecc0303f516eeba5912b89ea0d40d865bb60f01ad099c4bf4f38f' 
  AND token = 'NGhDu0eUpwaQQ6Rbrq6qFYWQ4HzGFkSy1x9DecvAz6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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