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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ab88afc2a9f481a43b5fbbc52e38099c341cc2cbf346861ee43e4fe953453ff' 
  AND token = 'L2cVXyHpzMpzLse8uPp9Iz24UMryTYj3B/YRm/aLhsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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