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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '584040f35fc3421efa185c3630f4ecec056bcc4098d748fd7b5c17e04272b781' 
  AND token = 'QTtnpoi0X5xwjHekXDf+Fd4cRUq7eQlZ7iscMUMdZh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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