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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '908c3bdbc58f68aa38816e7ac2deeb53ba3683c73b7e6626cb8e6469828576bc' 
  AND token = 'k5oj26JQIMwB3B2NZPKMbdjx3IQXaiwj+rbQymTMutA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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