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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb819428794d9c1d7181f8fbf82ee1f25919b2bde39c001b544f26e0c913f2ec' 
  AND token = 'iXC8c7y2YBoyEhICed9jI3GjtgIrwjBAaYcOnTdXH3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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