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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3025b75227f68e24c8f154fe976964168c571e276345dd28f263395f4f4a7aae' 
  AND token = 'idLJNhOGMWmxG8iRhEh1jxB6JI1QUXNXBpc0JUaCSCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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