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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c5db13885c12b02dbb4f91af6004cc7e991b0bbd81abbc49ed2230ad78b4a55' 
  AND token = '8Ta746wQNa/eMs2c0WQsYuzHQ/WjVswJsMziXC+FViU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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