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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be058a47de53f89281c453db68e5a23330b45dc97d5a3dc144dd22934368a2fa' 
  AND token = 'cxZ6zAjbWoiMkX99rjQ5/gJTWqJzqpe1BbEY3Wd6r9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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