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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb196072d7bdc96239ced4ee8fc0d0ba4727e4e2aa48c98d020204f1eb825af9' 
  AND token = 'GpScrP+iVkwEJYyCy/s9wSBeVEhB5vLDhBsMTNoRWsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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