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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d33af1aece2dc131e7a02eb5e16ee0d9548829590d9736d4f5da00f9b1f8ea0' 
  AND token = 'GwUe0Eg6Bs4iayx/nwtdf+jJGUCGjY1jG4OLqBunQW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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