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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61e03a4cbba44c575c9e30fb7678b6e86125e5d8f4cb8028f9fd6fd1c28e9b26' 
  AND token = 'UavPV+0+bHqKqcu0sm5Y7ip4lZPA5lTvtERM0kpBpgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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