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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8ebc74a5db1d5a1a743c9e978323241c892ccb2dd81c0e716cf5c0fdf3fd0ae' 
  AND token = 'yqtKs959Ik9wMJ/JTpTPOSUi9huVIlnLcMWCDC+LFqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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