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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56ff68427d03fa833c203f7d1a02596fab386b72536b3b5a544c801de0d46f29' 
  AND token = 'erADECWWvguQkChSQvzThef4H4IKBYtdiKcOLAPlNwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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