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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04764f5ea0139b44ee38c6d05ad2af05faff3c0081cbb6c84918be5b5ff0786e' 
  AND token = 'CmAUm8sme7DAVN5/d/Aw0vGnBSXXCck5xSKgEcZNQpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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