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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24107a78d4cbe18815782ad643a12911abaa94c104009d6538f397a096076193' 
  AND token = 'xo33WpbzPqRfbVXD9eaPCHxk8YBxD9nczBSCbHVa5Eo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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