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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6060a9adfc8a7e27fc3edc41657845d9b6779d9dc4e498d168c4f87d9cc1464f' 
  AND token = 'wC8trHQrXi5RcCMf/oes25QW0NnWbHPCyvSU7gKSKao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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