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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e33f7af471b1796a3c1fc4b05b4053d691ee8b36764e87ad92a5d390510ae9a' 
  AND token = 'JJLTa7aDm3kfCsJ6eMxqiHfwERDT2+tRFgVa4quD/kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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