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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1d00a49d57d7d725e66476eb04a7f1b82963e08756e796c4cd9590f695b12ba' 
  AND token = 'UZcQ9ZrK1Qknsd0F1Yp2i4aomBSGaMuXVUWxsD0WFTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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