SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a67ee9ead130d4ff75c7d928a409efc2d3b52133295a806fbcd79616393c1467' 
  AND token = '8EfVhGA7PpfAJTdnjh0ZDUXNJLigVZ8FfzRmzQp5BAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00125

JSON explain

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