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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb0be23fd68208c6c8b340accf84ffc51a20e3529b858f3182c626b37b99c27b' 
  AND token = 'MS8pMe5+7KVpd5fQHGkVIXvtsPkobiCSdftQRoSe7U0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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