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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b1e33f3ee857743e910d55dbe6ffd3350f08d8f38c36f658704115d082b73e8' 
  AND token = '/+gYN0krtqNp+wDOZZp2RpPZQgjHPbgnNL62v+u3xqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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