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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd2a5d10eda71fb1e905a1c542528fc7ba8bd49f1fc38c53d83be2e1d1352c20' 
  AND token = 'xzFNWPbMszM4TLNqIHhTNR+g+DnVwNm96JIEo7Eyp/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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