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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bc0e954d6c963e73db475f060c1c8147a000f52b66b9db563b0c236488255b9' 
  AND token = 'zH4UZB5QEB6nlZkZPltVsWNdA9Ek6XF9Sp9R897NZds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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