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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cf97f07ad0b447cec5b494e0f814ee09edf3dc439ca5840615e188b57a6e46d' 
  AND token = 'd8TO5P6HPRwDwAzPBngbUqKSW9QdCS83jFJpWF76dU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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