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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4db9695e19be831fad1dc37e27899fb966642a0712c61053c4dd24c4e6df18bb' 
  AND token = 'QYs6tiVdgPXBi5ztEzWCJFL5a5IxFTdU6+bTsn5oZDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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