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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47008c91734f1859953c00a477e25824da0038f6ee90da90802a4b83a48f8891' 
  AND token = 'T+GWOLPZ68mw8id/lZUP5dEbZlzlvAnm+yHdsx9mDQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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