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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47e94601e4a41b9e4dba505ea3be81c7e69ad1605b516768a250d67b90fb11e7' 
  AND token = 'D7rEofrH0XMRW93P1iWMtIb6oxILXNWZmn+DlydLj+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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