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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d738ef45488bdece49143ce5f41ae039cce008ecd8f1e8bf4888fd3857e5e79' 
  AND token = 'nlY/CtLqJS3iZx8NYzi6qj+ljHngrPIdt+dTJSndvsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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