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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31e8cc912b2dd86be34f230706db9db37b8ac8132a6cf8a5b23e052e88b09248' 
  AND token = 'G3sTOyAhyqFnVYXwB9aZ1Lnzqjcz6asp2zAnqViMaXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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