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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd992b20874b8f51a6f5ce89769ef1f08d60691c54c19df43fb86c710001b52d4' 
  AND token = 'wQbApJ+k9TnzVLsxJF+S2B/mzo4tUp28x8k7JyYnRNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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